7.1: <i>Invited Paper</i>: Novel OLED Display Technologies for Large‐Size UHD OLED TVs

Shin, Hong-Jae; Takasugi, Shinji; Park, Kwang-Mo; Choi, Soo-Hong; Jeong, Yun-Sik; Song, Byung-Chan; Kim, Han-Seop; Oh, Chang‐Ho; Ahn, Byung‐Chul

doi:10.1002/sdtp.10225

Cited by 71 publications

(47 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, they are fabricated on a silicon wafer, thus requiring high fabrication cost. To reduce the fabrication cost, active‐matrix OLED (AMOLED) displays on a glass or flexible substrate can be used for HMDs . However, the image quality of the AMOLED displays has suffered from the electrical characteristic variations of driving thin‐film transistors (TFTs) fabricated on the low‐temperature polycrystalline silicon (LTPS) backplane, which has the irregular grain boundaries .…”

Section: Introductionmentioning

confidence: 99%

“…However, the image quality of the AMOLED displays has suffered from the electrical characteristic variations of driving thin‐film transistors (TFTs) fabricated on the low‐temperature polycrystalline silicon (LTPS) backplane, which has the irregular grain boundaries . To compensate for these electrical characteristic variations, the external compensation method, luminance adjusting algorithm, and diode‐connection scheme have been researched . The external compensation method and luminance adjusting algorithm increase the system cost because of the additional logic blocks and memories for sensing the electrical characteristic variations of the LTPS TFTs and modulating the data voltage.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the fabrication cost, active-matrix OLED (AMOLED) displays on a glass or flexible substrate can be used for HMDs. [3][4][5][6][7][8][9][10][11] However, the image quality of the AMOLED displays has suffered from the electrical characteristic variations of driving thin-film transistors (TFTs) fabricated on the lowtemperature polycrystalline silicon (LTPS) backplane, which has the irregular grain boundaries. 3 To compensate for these electrical characteristic variations, the external compensation method, luminance adjusting algorithm, and diodeconnection scheme have been researched.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An AMOLED pixel circuit for high image quality of 1000 ppi mobile displays in AR and VR applications

et al. 2018

View full text Add to dashboard Cite

In this paper, an active‐matrix organic light‐emitting diode pixel circuit is proposed to improve the image quality of 5.87‐in. mobile displays with 1000 ppi resolution in augmented and virtual reality applications. The proposed pixel circuit consisting of three thin‐film transistors (TFTs) and two capacitors (3T2C) employs a simultaneous emission driving method to reduce the number of TFTs and the emission current error caused by variations in threshold voltage (Vth) and subthreshold slope (SS) of the low‐temperature polycrystalline silicon TFTs. Using the simultaneous emission driving method, the compensation time is increased to 90 μs from 6.5 μs achieved in the conventional six TFTs and one capacitor (6T1C) pixel circuit. Consequently, the emission current error of the proposed 3T2C pixel circuit was reduced to ±3 least significant bit (LSB) from ±12 LSB at the 32nd gray level when the variations in both the Vth and SS are ±4σ. Moreover, both the crosstalk errors due to the parasitic capacitances between the adjacent pixel circuits and due to the leakage current were achieved to be less than ±1 LSB over the entire gray level. Therefore, the proposed pixel circuit is very suitable for active‐matrix organic light‐emitting diode displays requiring high image quality.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An AMOLED pixel circuit for high image quality of 1000 ppi mobile displays in AR and VR applications

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In the mobile UHD panel, only one data driver IC is used, and it has 11,520 data channels corresponding to all column lines in the panel. In the large‐sized UHD panel, several data driver ICs are used, consisting of 640 or 720 data channels . Regardless of the panel type, P cap is much lower than P res .…”

Section: Power Consumption Of the Conventional And Proposed Two‐stagementioning

confidence: 99%

A small‐area and low‐power data driver IC using two‐stage DAC with a capacitor array for active matrix flat‐panel displays

2017

View full text Add to dashboard Cite

-A small-area and low-power data driver integrated circuit (IC) using a two-stage digital-toanalog converter (DAC) with a capacitor array is proposed for active matrix flat-panel displays. The proposed data driver IC employs a capacitor array in the two-stage DAC so as to reduce the DAC area and eliminate the need for a resistor string, which has high-power consumption. To verify the proposed twostage DAC, a 20-channel data driver IC with the proposed 10-bit two-stage DAC was fabricated using a 0.18-μm complementary metal-oxide-semiconductor process with 1.8 and 6 V complementary metaloxide-semiconductor devices. The proposed 10-bit two-stage DAC occupies only 43.8% of the area of a conventional 10-bit two-stage DAC. The measurement results show that the differential nonlinearity and integral nonlinearity are +0.58/À0.52 least significant bit and +0.62/À0.59 least significant bit, respectively. The measured interchannel deviation of the voltage outputs is 8.8 mV, and the measured power consumption of the 20-channel data driver IC is reduced to 7.1 mW, which is less than half of the power consumed by the conventional one.

show abstract

“…To allow for longer battery usage, the power consumption of these displays should be reduced. Recently, as indium-gallium-zinc-oxide (IGZO) thin-film transistors (TFTs) with extremely low leakage current have been successfully developed as the backplane of displays, 1,2 interest in displays that operate at a low frame frequency (F FRAME ) below 60 Hz has increased in attempt to decrease the power consumption of displays. 3,4 However, the human eye is sensitive to the flicker generated by low-frequency components, which is a long time-varying luminance.…”

Section: Introductionmentioning

confidence: 99%

A design method for flicker‐free liquid crystal display panels based on indium‐gallium‐zinc‐oxide thin‐film transistors

Kim

Kwon

2017

J Soc Info Display

View full text Add to dashboard Cite

This paper proposes a design method to reduce the flicker of liquid crystal display panels based on indium‐gallium‐zinc‐oxide (IGZO) thin‐film transistors (TFTs). The proposed design method employs a human factor model to convert the flicker measured at low frame frequency (FFRAME) to a modification value of the measured flicker (MVMF) having a frequency sensitivity of flicker, which can distinguish between no blinking and weak blinking. To investigate the causes and characteristics of flicker, the frequency component and increase factor of flicker are analyzed using the checkerboard and solid images. The increase factor in flicker is examined using IGZO TFTs with different antenna ratios (ARs) that cause the variation in threshold voltage of IGZO TFT. To verify the proposed design method, two test panels are implemented with asymmetric and symmetric ARs. The MVMFs of the 15 Hz component at a low FFRAME of 30 Hz show that the solid image with a symmetric AR has an MVMF of −62.9 dB, which is improved by 24.3 dB compared to that with an asymmetric AR. Therefore, the proposed method is applicable for a flicker‐free liquid crystal display panels at a low FFRAME.

show abstract

7.1: Invited Paper: Novel OLED Display Technologies for Large‐Size UHD OLED TVs

Cited by 71 publications

References 12 publications

An AMOLED pixel circuit for high image quality of 1000 ppi mobile displays in AR and VR applications

An AMOLED pixel circuit for high image quality of 1000 ppi mobile displays in AR and VR applications

A small‐area and low‐power data driver IC using two‐stage DAC with a capacitor array for active matrix flat‐panel displays

A design method for flicker‐free liquid crystal display panels based on indium‐gallium‐zinc‐oxide thin‐film transistors

Contact Info

Product

Resources

About